package com.bwie.filter;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.concurrent.TimeUnit;

/**
 * @author 军哥
 * @version 1.0
 * @description: TODO
 * @date 2025/3/24 14:02
 */

@Order(-1)
@Configuration
public class MyGlobalFilter implements GlobalFilter {

    @Autowired
    StringRedisTemplate stringRedisTemplate;

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //--1 获取请求参数
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        String url = request.getURI().getPath().toString();
        System.out.println("url:"+url);

        //--2 白名单
        if(url.contains("/login")) {
            System.out.println("白名单:" + url);
            return chain.filter(exchange);
        }
        if(url.contains("/uploadImage")) {
            System.out.println("白名单:" + url);
            return chain.filter(exchange);
        }

        //--3 检查token
        String token = request.getHeaders().getFirst("token");
        if(token == null) {
            System.out.println("token为空:" + url);
            // HttpStatus.UNAUTHORIZED == 错误代码是401
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        Claims body = Jwts.parser().setSigningKey("123456").parseClaimsJws(token).getBody();
        Integer userId = body.get("userId", Integer.class);
        String tokenKey = "token-" + userId;
        String redisToken = stringRedisTemplate.opsForValue().get(tokenKey);
        if(redisToken == null) {
            System.out.println("token已经过期了：" + url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        if(!token.equals(redisToken)) {
            System.out.println("token错误了：" + url);
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //--4 token续期
        stringRedisTemplate.expire(tokenKey, 60, TimeUnit.MINUTES);

        //--5 放行
        System.out.println("放行：" + url);

        return chain.filter(exchange);
    }
}
